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【单选题】
板框过滤机采用横穿法洗涤滤渣时，若洗涤压差等于最终过滤压差，洗涤液粘度等于滤液粘度，则其洗涤速率为过滤终了速率的()倍。A.
1;
B.
0.5;
C.
0.25
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举一反三
【单选题】By the time the FDA discovered its illegal production, the tobacco company____ several years to develop new narcotic tobacco products.
A.
are spending
B.
will have spent
C.
spend
D.
had spent
【简答题】In 2000, the Lost City, was first discovered by accident during a ______.
【单选题】有如下关系：课程表C，主键为c-id (char (4))。 若用如下语句建立成绩表SC： CREATE TABLE SC(s-id char(6)NOT NULL，c-id char(4)NOT NULL，score Inteeer)， 其中s-id为主键，c-id为外键(是C表的主键)。当执行如下语句肘，( )语句不能执行。
A.
INSERT SC VALUES('990101'，'NULL'，75)
B.
INSERT SC VALUES('990203'，'C601'，80)
C.
INSERT SC VALUES(NULL，'C602'，93)
D.
INSERT SC VALUES('990202'，'C604'，NULL)
【单选题】Australia began to assume its modem configuration by the Eocene Epoch, some 50 million years ago, when Antarctica broke away and drifted southward.
A.
status
B.
sphere
C.
shape
D.
situation
【判断题】The vowel is produced without (or with little) restriction during its production and is always voiced.()
A.
正确
B.
错误
【判断题】4-1. The Bauhaus has an architecture department during the first years of its existence.
A.
正确
B.
错误
【判断题】During the reign of the Liberal Party (1896~1911), Canada experienced its first economic depression.
A.
正确
B.
错误
【单选题】What is the reason for much more damage over the next 20 years than during the last 20 years?
A.
Hurricane activity is more or less readjusting to its long-term averages after a period of relative quiet.
B.
More people are placing themselves, their houses, yachts, and office high-rises in storm paths when they move to hurricane-prone states and their geologically fragile shorelines.
C.
The Atlantic basin is in the midst of a long-term active phase for hurricanes.
D.
The unusually high amount of storm activity can not be anticipated.
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